17 
ans to prove the truth of his hypothesis (however much he might 
be gratified at such a result) ; his aim is to ascertain whether the 
hypothesis is or is not true. As in religion we have “ justification 
by faith,” so in science we have “ justification by verification. 
ee 
Itc. 10. Glacial striae on one quarter acre of rock surface uncovered dur- 
ing quarry operations. Surface covered with quarried blocks. Several feet 
of glacial till in the background. One mile southwest of Leonardsville, 
Unadilla valley, N. Y. Facing northeast. (Photo by Prof. Albert Perry 
Brigham, 
Sermons in Stones 
A multitude of facts is known about the elacial boulders of 
Switzerland. They are often so large that water as an agent of 
transportation is definitely excluded; they are of a composition un- 
like that of the bedrocks of the region where they have come to 
rest; they do have the same composition as bedrocks in the re- 
gion whence the transporting glacier is known to have come; they 
are normally of rounded contour and smooth surface; whereas 
boulders of disintegration are of the same composition as the ad- 
jacent bedrock (from which they have been broken off), and 
mostly are angular and rough (lig. 10); the ledges over which 
the glacier has passed have been worn smooth by the friction of 
1e moving ice (Fig. 9); both the boulders and the surface of 
the underlying bedrock frequently have characteristic parallel 
ct 
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